Pump



Oct, 24, 1944. L. c. ROTTER ET AL PUMP Filed Sept. 20, 1943 3 Sheets-Sheet l c. ROTTER ET AL I 2,361,125

Oct. 24, 1944.

' I PUMP Filed Sept. 20, 1945 3 Sheets-Sheet 2 Oct. 24, 1944. L. c. ROTTER ET AL 3 Sheets-Sheet 3 PUMP Filed Sept. 20, 1945 Patented Oct. 24, 1944 PUMP Lutwin C. Rotter, Maplewood, and Victor G. Klein, and Rudy F. Schneller, St. Louis, Mo., assignors to Lincoln Engineering Company, 'St. Louis,.Mo., a corporation of Missouri ApplicationSeptember 20, 1943, Serial No. 503,058

9 Claims.

This invention relates :tolpumps, and Withregard to .certain more specific features, to hand.- operated pumps for pumping lubricants, caulking, and similar semi-solidmaterials.

Among the several objects of the invention may be noted the provision of arconveniently operable hand pump in which the-containing barrel is substantially coaxial with the line of push and in which is a biased follower which is retractable for filling purposes; the provision of a follower control operating as astroke limiting device; the provisionof a pump of the class described in which a condition of retraction may be maintained for purposes :of filling but in which "release may be easily accomplished by .the same hand thatop rates tojpum-p; andthe provision of apparatus of thisv class which is'simple and compact in form. Other objects sWill be inspart obviousand in part pointed .out'hereinafter.

The invention:;accordingly comprises the elements and combinationsof elements, features of construction, and arrangements of parts which will be exemplifiedin the structures hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which are illustrated several of various :possible embodi ments of :the invention,

Fig. l .is alongitudinal section showing OIlefOI-m:

Fig. 2 is a view similar to Fig. .1 but .fragmen- I tary and showing a retracted latched condition of a follower;

Fig. 3 is a vertical section taken on line 3-4 of Fig. .1; k a i Fig. 4 is a View similar to Fig: 3 but showing conditions like those in Fig; 2,.being taken on line 4-4 of Fig. 2;

.Fig. 5 is a fragmentary .side elevationof certain controlparts Qf'Figs. 1 and 2; I

Fig. 6 is a longitudinal section showing an alternative embodiment of the invention in a- Fig. 10 is a perspective detail of a handoper ated releasing member used in the Fig.6 form of the invention;

Fig. 1-1 is a longitudinal section showing another alternative form of the invention with the follower in a released position;

Figs. 12 and 13 are vertical sections taken respectively on lines l2-' -'l2an'd 13-43 of Fig. 11;

Fig. 14 is a fragmentary view similar to parts of Fig. 11 but showing the follower in retracted and latched position;

Fig. 15 is a longitudinal section showing another form of the invention; and,

Fig. 16 is a vertical section taken on line l6l6 ofFig. 15.

Similar reference characters indicate corresponding parts throughout the several views of the drawings.

- Hand operated pumps .for pumping semi-solid lubricants and the like are often .preferredin a form .in which the lubricant barrel is coaxial with the line of push exerted on the reciprocating, operatinghandle. However, the pumps have been built so that :the necessary retraction of the internal follower is awkward. Furthermore, the mechanism, if any, used for retracting the fol lower has made it difficult to arrange a desirable limitation of the pumping stroke'while material is being. pumped. Referring now more particularly to Figs. l-5 which show one form of the invention to be de-' scribed, numeral I shows acontainer cylinder enclosed at one end by a pump head 3 and at the other end by a closure cap .5. In the outlet head 3 is a pump cylinder 1 delivering through an outlet check valve 9. Valve 9 delivers to a suitable attached couplin l l which may be of any of the types usually used for the purpose.

Reciprocating intoand rearwardly out of the cylinder 1 is a plunger 13, wherewith lubricant is withdrawn from the container 1 and pumped to the coupling ll through the check valve 9. The

plunger I3 is coupled to an operating stem i5- which passes substantially coaxially through the cylinder I and rearwardly out of the cap 5 through an opening I! as indicated. A connection I9 between the plunger !3 and the stem I5 provides a shoulder for contact with the nose 2i of a follower piston assembly 23. During pumping strokes, this contact does not occur between I9 and 2| because ordinarily, under a filled or partially filled condition of the container I, the follower 23 is closer to the cap 5 than shown. In Fig. 1 the container I is about empty and ready for a refill. The follower'23 ordinarily in its other position'is biased against any material in the container. This is accomplished by means of a compression spring 25 reacting from the cap 5.

The back stroke of the plunger i3 is limited by'the fact that the stem 15 is shouldered as indicated at 21 and while this shoulder may pass through the opening |1 its further movement is normally limited by contact with a bushing 29 of a then-fixed latch contro1 cup 3|. This cup 3| while being slidable on the reduced section 33 of the stem during filling operations (see Fig. 2), is fixed in position on a protrusion 35 of said cap 5 during pumping operations. Fixation is accomplished by bayonet grooves 31 formed in the cup 3|. These grooves are engageable with bayonet lugs 39 arranged on a protrusion 35 of cap 3| (see Figs. 1, 3, and 5).

Arranged crosswise in the protrusion 35 is a laterally movable latch 4| formed as a yoke 43 in-which is an opening 45. Extending from opposite sides of the yoke 43 are rectangular tongues 41 which slide through opposite rectangular openings 49 in the protrusion 35. A spring 5| biases the latch from the position shown in Fig. '3 toward that shown in Fig. 4. Bias is prevented when the control cup 3| is telescoped over the protrusion 35 and bayonet-locked into position, as indicated in Figs. 1. 3 and 5. There then occurs camming of the latch 4| into the centered position shown in Fig. 3. The cup 3| flares as shown at 53 so as to effect said camming. Thus telescoping and rotary latching of the cup 3| on the protrusion 35 results in camming the latch 4| into the centered position of the opening 45. In either the centered or eccentric positioning of the opening 45, the shoulder 51 may pass back and forth through said opening 45 and to the opening I1, When the cup 3| is in attached position engagement occurs between the shoulder 21 and the bushing 29 for limiting the backward stroke of the plunger |3. The opening 45 when centered (Figs. 1 and 3) admits free sliding in either direction of a catch member 55 which forms an extension from the follower piston 23. Catch 55 slides on the stem |5. The catch member 55 carries an axial cam 51 and behind this is a groove 59. Thus when the parts are as shown in Fig. 1, even though the groove 59 be brought within the opening 45, the spring 25 may bias the follower 23 against any material in the container Such bias tends to prime said material into the cylinder 1 when the plunger I3 is withdrawn on the back-stroke to the extent limited by engagement between shoulder 21 and the bushing 29.

On the other hand, when the control cup 3| is released and drawn back as shown in Fig. 2, the spring 5| biases the latch 4| sidewise as shown also in Fig. 4. Thereupon, since the stop 29 is no longer effective in connection with the shoulder 21, the rod |5 may be Withdrawn by pulling on the handle 54 as shown in Fig. 2. Under such conditions, the shoulder |9 (behind plunger l3) contacts the nose 2| of follower 23, thus pulling back the follower against pressure of the spring 25. Then the cam 51 temporarily deflects the latch 43 as the latter is approached and thereafter said latch drops in behind the cam 51 into the groove 59. Final rearward motion is l mited by contact between cam 51 and the inside of the cap 5. Thus the latch 4| holds the catch 55 and the follower 23 is permanently retracted despite pressure from spring 25, so that the container I may be conveniently refilled. Refilling is of course done with the head 3 removed by unthreading. After filling, and replacement of the head 3, the rod |5 may be again pushed into the container I, that is, into pumping position, after the control cup 3| has been replaced in its bayonet catch position on the protrusion 35, as shown in Figs. 1 and 5. Then during reciprocation of stem |5 from handle 54, the follower 23 is biased by the spring to feed lubricant toward the cylinder 1.

Referring to Figs. 6-10, another embodiment of the invention will now be described. Reference numerals used in connection with the above description will be again used where there is functional correspondence.

The cap at the rear end being quite different in form (though not in broad function) has been given the reference character 6|. This cap is flat and provided with two crescent shaped openings 63 as shown in Fig. 9. It is also provided with a key-shaped opening 65 for centrally accommodating the stem l5 and extended to accommodate two floating clutch jaws 61. Each jaw 61 has an outside tail portion 69 and an inside catch portion 1|. Between these portions 69 and 1| each is curved as at 13. Part 13 is retained in the lateral extensions of the openings 65 and by contact with the sliding stem l5. The clutch jaws 61 are biased shut (toward their Fig. 6 position) by means of an axially movable, cupshaped camming member 12 which has a flange 15 and a hollow conical end 11. The biasing spring 25 rests and pushes upon the flange 15, and thus besides biasing the follower 23 to the left biases the camming member 12 to the right. If not interferred with the member 12 will be pushed to a position wherein the flange 15 rests upon the inside of the cap 6| (see Fig. 6). Under such conditions, the cone shaped portion 11 cams inwardly the inner ends 1| of the jaws 61.

In its other position (Fig. 7) the camming member 12 releases the jaws 61 so that their portions 1| may move outward. The member 12 is adapted to be moved to the Fig. 7 position by means of the control cup 19, shown completely in Fig. 10. This cup comprises a cylindrical part 8| provided with bayonet slots 83 and a conical part 85, the latter being attached 'to a bushing 81 which supports a finger grip member 89. The bushing 81 forms a sliding engagement with the reduced section 33 of the stem l5. A spring 9| reacts between the bushing 81 and a grip 93 carried on the extension 33. The grip 93 is the grip for reciprocating the stem I5 and is therefore for operating the pump. By means of the hand which holds the grip 93, the fingers may be engaged with the grip 89 to operate the control cup 19. The diameter of the cylinder 8| is such that the portions between the bayonet slots 83 may be introduced into the openings :63. The portions 64 between openings 63 pass into the bayonet slots 83. Therefore, by pushing the control cup 19 into the openings 63 and turning it counterclockwise, the camming member 13 may permanently be placed in the position shown in Fig. 7 wherein the jaws 61 are released. They are then cammed open by the cone 85 on cup 19. On the other hand, by rotating the control cup 19 clockwise and withdrawing it from the cap 6|, the bias of spring 25 will move the camming member 12 to cam the jaws 61 shut as shown in Fig, 6.

When the control cup 19 is fixed on the cap 6|, the bushing 81 is in fixed position behind the open jaws 61. Thus although the shoulder 21 may be brought through the jaws, the backstroke of the stem I5 is limited by engagement of shoulder 21 with the then fixed bushing 81. Also, at this time, even though the catch 55 (including parts 59 and 51) should be within the confines of the jaws 61, the latter will not grip. Thus, the follower 23 will advance freely toward the head 3 under compression from spring 25 to feed material to the purnpcylinders :I. Tliisoccurs while the plunger I3 is reciprocated through the stem I5 and'grip 93.

When .the cup "I9 is rotated clockwise and-withdrawn from the cap 6| to the position shown in Fig. 6, the support for the :camming member "I3 is withdrawn whereupon the spring '25 biasessa-id member I3 into engagement with the cap BI and causes the cone 1] to bias inwardly the gripping portion 'II of the jaws 67. Since the bushing 82'! has now been withdrawn, it is "now possible to move back the stem I5 by pulling back on the member 93. Engagement of the shoulder I9 with the nose 21 of the follower '23'will result in driving the catch into position between the ends II of the jaws 61. These jaws temporarily ride up the cam 51 and then drop into the groove 59 under bias from the conical portion 11. The result is that the followeris held back in the position shown in Fig. 6. Reloading the container -I may then be carried out. After loading, the jaws are released as above indicated and as is shown in Fig. '7, that "is, by again inserting and attaching the control cup 79 to thecap 6|.

The spring 9| is to effect *a return stroke "for the pumping action when the deviceisorganized as in Fig.7.

In Figs. 11 to 14 is shown another "form of the invention in which like numerals again designate like-functioning parts, so far as applicable In this case the cap 'on the container I again has a new form and numeral 95 has been applied thereto. It has an opening 91 for accommodating the latch control member 99 which is in the form of a cylinder sliding on the extension 33 and passing through said opening 91. This control member 99 carries laterally extending pins I 9! which in one angular position of the control member may pass through extension I93 of the opening 91. In a 90-degree removed position, when within the cap, the pins I9I seat in sockets I95 of cap 95 (Fig. 12.). These pins I9I are lo cated under a ring I97 having radially extending legs I99 (Figs. 11 and 13). The spring 25 biases against the legs I99. Thus the ring I 91 is normally pressed against the 'pins I 9| andseats them in the sockets I05. The spring 25 reacts from the follower 23-while at the same time biasing'it.

Inside of the ring I9! is a cup-shaped member III, the base of which is cruciiformand provided with legs H3 between the legs I99. Since the spring 25 also is above these legs I I3 it also holds the cup-shapedmember .I II in place. The cupshaped member. III has a central opening H5 through which extend two hollow jaws Ill. These jaws spread and accommodate the control cylinder 99 when .the latter .is moved inward, as indicated in Figs. 11 and 13. They are biased inwardly against spreading by radial springs .II 9 within the cup I I I.

When the control cylinder 99 is withdrawn by finger action on the handle I2.l thereon. as indicated in Fig. 14. the springs II9 push the jaws III inward. Then when the follower .23 .is drawn back '(by drawing back the stem I5 which contacts shoulder I9 with nose U) the catch .55 forces its camming portion 51 into the jaws I II, which are beveled for the purposes, as shown at I23. This causes lug portions I25 on the jaws to drop into the groove 59 and to hold back the follower against the expansion of the spring 25. When the control member 99 is reinserted through the opening 91 .(the pins I9I passing through the openings I93) the nose of the cylinder 99 being beveled at :I2'Ilfor the purpose, wedges the jaws apart soas to release them from the catch part 55, 59 and '51; whereupon the follower is free "for biased movement under action of the spring '25. Of course "the control member 99 is held" in this inserted position as shown in Figs.

. 11 and 12 by'rotating it so that the pins IIII,

after entry through the openings I93 will become seated in the sockets I95. It will be noted that the outside diameters of members I99 and H3 are larger than the inside diameter of table I. Hence members I99 and H3 can move only enough to accommodate rotation of pins :IIII out of the recesses I95. They cannot 'move down into the-tube I.

In Figs. 15 and '16 is shown a form'of the invention in which-no hold-back means is shown forthe follower 23, like numerals designating'like functioning parts again. In this casethe biasing spring forthe follower 23'more closely hugs the stem I5 and has therefore been renumbered as I29. The caphas been renumbered as I29'and carries centrally "a fixed bushin I3I through which'the stem I5 and the spring I28 are'adapted to pass. This bushing on-the outside is "provided with-ahead I33 b'ehind which is a groove I35 with recessed portions 13'! formed by radial milling. At degrees tothe recessed portions I3'Iare flats I39. On the reduced portion 33 of the stem is aslidingbushing I38'held'in the center andbott m of a cup MI. The latter hasturned-in lugs as ind cated at I43. These lugs are adapted in onepcsition'to pass over the flats I39 and upon SID-de ree rotation to seat in the recesses I31. I This i under b as of 'thebushing I38 from spring I129. On the other hand when the cup MI .is turnedflfledegrees from the'position shown in Fig. 15 and released, the'stem I5 and spring I28 along with the follower may be drawn back for refilling purposes. The .chief point in connection with Figs. 15 and 16 is that the bushing I38, when thecun M! is infixed position on the bushing I3I, acts as a stop for the shoulder 21 so that the backstroke of the pump is limited.

Attention is hereby directed to the copending application of Victor G. Kle n, one of the appl cants herein. Serial :No. 503,060, dated September 20. 1943. for Dispenser.

In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.

As many changes could be made in the above constructions without depart ng from the scope of the invention, it is intended that all matter contar ed in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

We claim:

1. A pumpcomprising a container, 2. cylinder carried on the container and communicating therewith and having an outlet, a plunger reciorocating into and out of said cyl nder, a driving stem supporting said'plunger and passing through the container. :a cap accommodating egress of the .stem from the container, a follower in the container and surrounding said stem. spring means biasing the 'follower toward the cylinder, a catch carried by the follower, a latch adjacent said cap, andamovable control memberoperative frorn'the outside of said cap and cooperating with said latch through open means in the cap so that in one position of the control member, the latch is automatically operative to hold said catch, and in anotherpositionof the control member to release said latch, means cooperating between the stem and the follower whereby the latter may be forced by withdrawal of the stem from the con-' tainer into cooperative position with respectto said latch but allowing reinsertion of the stern into the container whether or not the follower is biased away from said latch, and cooperating means between said control member and the stem whereby when the control member is in latchreleasing position, reciprocation of the stem is limited to an amount only sufiicient to operate the plunger with respect to the cylinder for pumping of material from the container to the outlet.

2. A pump comprising a containena pumping mechanism at one end of the container, a cap at the other end thereof, a reciprocating stem passing from said pumping mechanism through said container and out of the cap and provided exteriorly with hand operating means, a follower in said container, a spring biasing said follower toward the pumping mechanism, a catch movable with the follower, latching means for said catch located within said cap, a control member outside of said cap and sliding on said stern beneath said hand operating means, and quick detachable means between said control member and said cap, means biasing said latch to a position in which it will hold the catch when the latter is brought into cooperative position with the latch, and a cooperating means between said control member and said latch whereby when the control memher is attached to the cap, said latch is in releasing position with respect to sa d catch, stop means associated with the control member, and a portion on the reciprocating stem engageable with said stop means when the control member is in attached position to the cap, in which position said latch is in said catch releasing position.

3. A pump comprising a container, a pumping mechanism at one end of the container, a cap at the other end thereof, a reciprocating stern, passing from said pumping mechanism through said container and out of the cap and provided exteriorly with hand operating means, a follower in said container. a spring biasing said follower toward the pumping mechanism, a catch movable with the follower, latching means for said catch located within said cap, a control member outside of said cap and sliding on said stem beneath said hand operating means, mean biasing said latch toa position in which it will hold the catch when the latter is brought into cooperative position with the latch, and cooperating means between said control member and said latch whereby when the control member is attached to the cap, said latch is in releasing position with respect to said catch, said cap being formed as a protrusion and said control member being formed as a cup telescoping therewith, a bayonet catch means between the cup and the protrusion, said latch comprising a laterally slidable yoke borne within openings in said protrusion and freely surrounding said stem, and said catch comprising a member adapted to be held by said latch when the latter is disengaged by the cup.

4. A pump comprising a container, a pumping mechanism at one end of the container, a cap at the other end thereof, a reciprocating stem passing from said pumping mechanism through said container and out of an opening in the cap, a hand-operating means on the stem, a follower in said container, a spring biasing said follower toward the pumping mechanism, a catch movable with the follower, latching means for said catch located within said cap, a control member outside of said cap and sliding on said stem, quick-detachable means between said control member and said cap, means normally biasing said latch to a position in which it will hold the catch when the latter is brought into cooperative position, and cooperating means between said control member and said latch whereby when the control member is attached to the cap, said latch is placed in releasing position with respect to said catch.

5. A pump comprising a container, a pumping mechanism at one end of the container, a cap at the other end thereof, a reciprocating stem passing from said pumping mechanism through said container and out of an opening in the cap,

a hand-operating means on the stem, a follower in said container, a spring biasing said follower toward the pumping mechanism, a catch movable with the foll'ower, latching means for said catch located within said cap, a control member outside of said cap and sliding on said stem. quick-detachable means between said control member and said cap, means normally biasing said latch to a position in which it will hold the catch when the latter is brought into cooperative position, and cooperating means between said control member and said latch whereby when the control member is attached to the can, said latch is placed in releasing position with respect to said catch, said latch comprising rocking jaws pivotally held in accommodating portions of said opening in the cap and reaching through the cap while rocking on the stem, a cone member biased toward the cap by said spring, said quick-detachable means comprising a bayonet-shaped means engageable through openings in said cap to contact with said cone member to hold the latter out of biasing engagement with said jaws when the control member is attached to the cap.

6. A pump comprising a container, a pumpingmechanism at one end of the container, a cap at the other end thereof, a reciprocating stem passing from said pumping mechanism through said container and out of an opening in the cap. a hand-operating means on the stem, a follower in said container, a spring biasing said follower toward the pumping mechanism, a catch movable with the follower, latching means for said catch located within said cap, a control member opening in the cap and reaching through the cap while rocking on the stem, a cone member biased toward the cap by said spring, said quick-detachable means comprising a bayonet-shaped means engageable through openings in said cap to contact with said cone member to hold the latter out of biasing engagement with said jaws when the control member is attached to the cap, and conical means on the quick-detachable means engageable with the outside portions of said jaws to rock them out of catch-holding positions when the pick-detachable means is attached.

7. A pump comprising a container, a pumping mechaism at one end of the container, a cap at the other end thereof, a reciprocating stem passing from said pumping mechanism through said container and out of an opening in the cap and provided exteriorly with hand-operating means, a follower in said container, a spring biasing said follower toward the pumping mechanism, a catch movable with the follower, latching means for said catch located within said cap, a control member outside of said cap and sliding on said stem and located beneath said hand-operating means, quick detachable means between said con- 7 trol member and said cap, means biasing said latch to a position wherein it will hold the catch when the latter is brought into cooperative position, and cooperating means between said control member and said latch whereby when the control member is attached to the cap, said latch said container and out of an opening in the cap and provided exteriorly with hand-operating means, a follower in said container, a spring biasing said follower toward the pumping mechanism, a catch movable with the follower, latching means for said catch located within said cap,

a control member outside of said cap and sliding on said stem beneath said hand-operating means, and quick-detachable means between said control member and said cap, means biasing said latch to a position wherein it will hold the catch when the latter is brought into cooperative position with the latch, and cooperating means between said control member and said latch whereby when the control member is attached to the cap, said latch is placed in releasing position with respect to said catch, said latch comprising radially movable jaws within the cap, means biasing the jaws inwardly, said control member outside of the cap being carried on said stem and movable through an opening in the cap for engagement with said latch interiorly of the cap to overcome said bias and allow free motion of the follower independently of the latch, the jaws constituting semi-cylindric members arranged around said stem, said control member constituting a cylinder movable on the stem and insertable between the jaws to expand them against said bias, and a bayonet catch arrangement between said control cylinder and the catch.

9. A pump comprising a container, a cap therefor having a bayonet opening, a follower in the container having a catch, an axial spring biasing the follower from the cap, hemi-cylindric latching jaws within the cap cooperative with the catch to hold back the follower, means surrounding said jaws provided with radially operative spring means biasing said jaws toward latching position, a plate within the cap and resiliently held in position by said axial spring, bayonet control means operable through said bayonet opening adapted to spread said jaws to release position and upon rotation to be resiliently gripped between the cap and said resiliently positioned plate.

LUTWIN C. ROTTER. VICTOR G. KLEIN. RUDY F. SCHNELLER. 

